RE: RMAN restore times

Thanks for your response, I have 2 questions/clarifications:

1. You mention "RMAN backyp from the mirror then re-sync". How is this possible? The mirror copy will be in hot mode, you have to recover the database to open it. Doesn't the database have to be open in order for RMAN to back it up? Did I miss something? If so can you clarify?
2. Regarding restore times, what times have people been seeing with RMAN? If you can post your tape technology that would be much appreciated. If we stick with BCV then it's really hard to beat that technology for restore times but can we get close?

Thanks!
-----Original Message-----

From: Hallas, John, Tech Dev [mailto:John.Hallas_at_gb.vodafone.co.uk] Sent: Thursday, August 04, 2005 11:53 PM To: Khemmanivanh, Somckit; Lora Martin; oracle-l_at_freelists.org Subject: RE: RMAN restore times

If I had BCVs available I would break the mirror then RMAN backup from the mirror then re-sync.
You have a 2TB database. Somckit takes 4 hrs to restore a 4Gb file. There should be / is a fundamental difference in resources or configuration between those 2 setups.

If you have BCVs etc I would expect you to have fast tape technology and the whole database should be restorable in maybe 4 hrs not just a 4Gb file.

One of the major determining factors in restore times I have seen is the time waited to load the required tape or the contention with other jobs. That is often not taken into account when the overall time is calculated.

John

-----Original Message-----

From: oracle-l-bounce_at_freelists.org
[mailto:oracle-l-bounce_at_freelists.org] On Behalf Of Khemmanivanh, Somckit
Sent: 04 August 2005 18:21
To: Lora Martin; oracle-l_at_freelists.org
Subject: RE: RMAN restore times

Thanks for your feedback.

Yes, my main hesitation with the RMAN backups for such a large database was the restore times.

Why would a 4 GB file take 4 hours to restore? Contention for tape resources? Really slow tape drives, network?

Thanks!
-----Original Message-----

From: Lora Martin [mailto:lmartin_at_clubmom.com] Sent: Thursday, August 04, 2005 10:01 AM To: Khemmanivanh, Somckit; oracle-l_at_freelists.org Subject: RE: RMAN restore times

If you have BCV - I would use that. I have used EMC BCV... very fast... then go to tape from there. When we restored 4GB file using RMAN from tape on a 2TB system - the restore took 4 hrs

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